. >>> paul ryan will face off in a debate against joe biden. today he was still on the campaign trail where he was introduced by kid rock to a crowd in michigan. biden is prepping for the debate. he said he has been studying campaign positions and promises to hold ryan responsible while sticking to the facts. you can watch it live here on ktvu channel 2news. it starts at six. a special edition of the news. >> the polls opened up in many counties for early voting. kara lieu says why -- some votes may not be counted. >> 22-year-old allen cast his ballot early today because he is headed to thailand for ten months. >> if you care anything about the country like this is the one thing you can do as a person. >> reporter: it turns out they are nearly four times more likely to have their ballot thrown out because of a rejected signature. >> signature is like your security key. >> reporter: elections chief said that -- his office noticed the spike in rejected significance tours in 2010. >> maybe the older population. we ran the study. it wasn't the olde